One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10)(11,15)(12,16)(13,14)(17,18,21,19)(20,22,24,23)(25,26,28,30)(27,31,32,29)(1,3)(2,4)(5,6)(7,8)(9,11,13,16)(10,12,14,15)(18,19)(22,23)(1,4,5,8)(2,6,7,3)(9,10,13,14)(11,15,16,12)(17,19,21,18)(20,22,24,23)(1,3)(2,4)(5,6)(7,8)(9,12)(10,11)(13,15)(14,16)(25,27,28,32)(26,29,30,31)(1,4)(2,3)(5,8)(6,7)(9,10)(11,12)(13,14)(15,16)(17,20)(18,22)(19,23)(21,24) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.